去除BOM头,UTF-8 BOM又叫UTF-8 签名,其实UTF-8 的BOM对UFT-8没有作用,是为了支援UTF-16,UTF-32才加上的BOM,BOM签名的意思就是告诉编辑器当前文件采用何种编码,方便编辑器识别,但是BOM虽然在编辑器中不显示,但是会产生输出,就像多了一个空行via:http://www.oschina.net/code/snippet_162279_10073

killbom.php

if (isset($_GET['dir'])){ //config the basedir 
    $basedir=$_GET['dir']; 
}else{ 
    $basedir = '.'; 
}
 
$auto = 1;
 //把以下代码保存为：killbom.php，放在要转换的文件根目录下执行即可
checkdir($basedir);
 
function checkdir($basedir){ 
    if ($dh = opendir($basedir)) { 
        while (($file = readdir($dh)) !== false) { 
            if ($file != '.' && $file != '..'){ 
                if (!is_dir($basedir."/".$file)) { 
                    echo "filename: $basedir/$file".checkBOM("$basedir/$file")."<br>"; 
                }else{ 
                    $dirname = $basedir."/".$file; 
                    checkdir($dirname); 
                } 
            } 
        } 
    closedir($dh); 
    } 
}
 
function checkBOM ($filename) { 
    global $auto; 
    $contents = file_get_contents($filename); 
    $charset[1] = substr($contents, 0, 1); 
    $charset[2] = substr($contents, 1, 1); 
    $charset[3] = substr($contents, 2, 1); 
    if (ord($charset[1]) == 239 && ord($charset[2]) == 187 &&ord($charset[3]) == 191) { 
        if ($auto == 1) { 
            $rest = substr($contents, 3); 
            rewrite ($filename, $rest); 
            return ("<font color=red>BOM found,automatically removed.</font>"); 
        } else { 
            return ("<font color=red>BOM found.</font>"); 
        } 
    } 
    else return ("BOM Not Found."); 
}function rewrite ($filename, $data) { 
    $filenum = fopen($filename, "w"); 
    flock($filenum, LOCK_EX); 
    fwrite($filenum, $data); 
    fclose($filenum); 
}